Measurement of Fast Neutron Rate for NEOS Experiment
Y.J. Ko, J.Y. Kim, B.Y. Han, C.H. Jang, E.J. Jeon, K.K. Joo, B.R. Kim,, H.J. Kim, H.S. Kim, Y.D. Kim, Jaison Lee, J.Y. Lee, M.H. Lee, Y.M. Oh, H.K., Park, H.S. Park, K.S. Park, K.M. Seo, Kim Siyeon, G.M. Sun
TL;DR
This paper reports on the measurement of fast neutron rates at the NEOS neutrino experiment site and a nearby overground site, highlighting the background differences during reactor operation and shutdown.
Contribution
The study provides the first measurement of fast neutron background at the NEOS experiment site using pulse shape discrimination with a liquid scintillator detector.
Findings
Fast neutron rate at NEOS site is about 20 per day during reactor-on and off periods.
Overground site has a fast neutron rate approximately 100 times higher than at NEOS.
Reactor operation does not significantly change the measured neutron rate at NEOS.
Abstract
The fast neutron rate is measured at the site of NEOS experiment, a short baseline neutrino experiment located in a tendon gallery of a commercial nuclear power plant, using a 0.78-liter liquid scintillator detector. A pulse shape discrimination technique is used to identify neutron signals. The measurements are performed during the nuclear reactor-on and off periods and found to be ~20 per day for both periods. The fast neutron rate is also measured at an overground site with a negligible overburden and is found to be ~100 times higher than that at the NEOS experiment site.
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